Sheltered by dunes, this beach along Nantucket Sound has calm waters for swimming, hard-pack sand, and lots of shells. It’s safe for children, with lifeguards in-season. There is a shallow sandbar, and many people paddleboard here. Dunes and beautiful harbor views of sailboats and ferries. Restrooms, changing room, and faucet for rinsing off the sand are available. There are vending machines in the parking area, but no concessions, so bring your own food and beverages. Accessing the beach requires a laborious walk along a narrow path over a soft-sand dune trail. A metal ramp at the end of the trail provides access down the bank onto the beach during the summertime.
Grilling on Dionis Beach is allowed with a charcoal or propane grill (be sure to properly dispose of ash and do not leave used charcoal on the beach). Small, enclosed cooking fires located away from any flammable material or dune vegetation are allowed without a permit. There are no trash receptacles on the beach so please bring any trash you create with you when you leave.
This beach is three miles from town by bike on the north side of Eel Point Rd; off Madaket Road, look for the white painted boulder on the right marked “Dionis.” There is parking, but it tends to fill quickly in July and August and on holiday weekends. Beachgoers can take NRTA shuttle bus to Eel Point Road stop and walk. Lifeguard (in season). Sections of the beach may be closed during shorebird nesting season. Oversand driving is not permitted at Dionis.